The windows are almost all lancets, but some of the side windows are larger, and some of those in the east end have a little tracery introduced, thus indicating a rather late date in the style. The elegant turrets at [Illustration: FIG. 546.--Elgin Cathedral. East End.] [Illustration: FIG. 547.--Elgin Cathedral. South Transept and South Side of Choir.] the east end (Fig. 546) are ornamented with trefoiled arcades, and have been finished on top with octagonal pyramidal roofs and canopied windows. All the features of the choir seem to point to its having been erected late in the thirteenth century, probably after the fire in 1270, reported by Fordun. The details are all of pure first pointed form, but from the exuberance of the enrichments the building was apparently somewhat late in the period. The buttresses on the exterior of the clerestory are of small size (Fig. 547), the building having evidently not been designed for a vault, but only intended to carry a wooden roof over the central choir. The side aisles, however, were vaulted and groined. About the centre of the side walls of the choir there is a projecting respond on each side (see Fig. 545), which seems to indicate that at one time it had been intended at this point to throw an arch over the choir to separate it from the presbytery, and the buttress at this point is of extra size; but some change of the first design has apparently taken place, and the space above the caps of the responds has been sloped off in a pyramidal form, and ornamented with a series of small leaf enrichments. Whether this change of design was adopted voluntarily, or in consequence of damages caused by the fire above referred to, it is now impossible to say, but the result proves how beautifully an accidental alteration could be turned to good account in the olden time. Possibly the choir only extended to this point before 1270. The aisles of the choir do not extend the full length of the choir, but stop short, as is usual, by two bays so as to admit more light into the presbytery. The north aisle is separated from the central choir by a solid wall, having only one opening, through which a passage leads from the choir across this aisle to the chapter house. Along the south side of the choir there runs another and wider aisle (Fig. 548), which is said to have formed the lady chapel. It was connected with the choir by wide arched openings having first pointed piers and mouldings with round moulded caps, and contains several ancient monuments. The tracery and other details of this aisle (see Fig. 547) prove that it has been considerably altered at a later date than the choir.